The invention provides a portable miniature energy-storing spot welding machine. The portable miniature energy-storing spot welding machine comprises a nickel-metal hydride battery pack (1) equipped with a charger, a spot welding control circuit module (2), an energy-storing charging switch (3), a Farad-level energy-storing capacitor (4), a spot welding discharging switch (5), a spot welding gun (6) provided with a manual control switch, a grounding clamp (7) connected with the welding machine through a cable, and an energy regulation and display panel (8), wherein the nickel-metal hydride battery pack (1), the spot welding control circuit module (2) and the energy-storing charging switch (3) are connected mutually, the spot welding control circuit module (2) is further connected with the spot welding discharging switch (5), the spot welding gun (6), the grounding clamp (7) and the energy regulation and display panel (8), the energy-storing charging switch (3) is connected with the Farad-level energy-storing capacitor (4), the Farad-level energy-storing capacitor (4) is connected with the spot welding control circuit module (2), the energy-storing charging switch (3), the spot welding discharging switch (5) and the energy regulation and display panel (8), the spot welding discharging switch (5) is connected with the spot welding gun (6), the spot welding gun (6) is connected with the energy regulation and display panel (8), and the grounding clamp (7) is connected with the energy regulation and display panel (8). The portable miniature energy-storing spot welding machine is designed for welding thin/ultra-thin steel plates or delicate and miniature parts, and can be used for solving the problem of fast on-site installation of some sensors.